- Isaac Asimov - "Youth". A story of young kids "catching" aliens and trying to hide that from their parents. Available in audio at "librivox.org"
- "Close Encounters of the Third Kind " - a 1977 Steven Spielberg film
- "ET" - a 1982 Steven Spielberg film
- "Hard to be a God ", 1989 - a Soviet-German science-fiction film about people from Earth observing and getting involved in struggles of another civilization, read Wikipedia intro
- Carl Sagan in episode 12 of "Cosmos" on encounters with UFO and contacting other civilizations
- A possible future source of knowledge may be a contact with another civilization. What is a possible impact of contacting and interacting with that civilization?